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Bukh/westerbeke 20 Manual start hand crank

Brass Dragon

Member II
Pulled my engine crank out today. The crank is 19 mm diameter bar stock but if you are building one, I think you could use 3/4" diameter bar stock. I tried a 3/4 dowel into the engine and it fits, if maybe a bit snug. The cranking offset is 5.5 inches (140 mm) centerline to centerline. The bends are approx. 3/4" inside bend radius. The shear pin is approx. 5/16"d x 1-7/16" (probably 8 mm x 36 mm). The pin is located 1.5 inches from the end of the crank. I don't think these are any critical dimensions except it cant be too large a diameter for sliding into engine. Btw, TAPH20- I have a BUKH DV20 project engine in my garage if you want it. I replaced my DV20 with a DV24. Most parts are not interchangeable. Was planning to rebuild this one but gathering dust, me getting older. Seattle.Bukhcrank.jpg
 

TAPH2O

Member II
I will ask my daughter about the engine it’s her boat but you can never have enough boat engines.
another question a[bout some of the lengths of the straights and how is the sleeve held on.
many thanks
taph2o
 

Brass Dragon

Member II
I believe the crank has a groove cut into it and the thin red tube sleeve has been installed to the crank and a corresponding groove rolled into it to act as the retainer.
 

TAPH2O

Member II
Looks about right.
im looking into having a socket welded on to straight stock that would accept winch handle star drive that would allow me to use my Milwaukee 1/2” right angle 24volt drill with winch attachment.C4B49815-2DA2-46B0-A7D8-B9C42ABA8345.jpeg
 
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TAPH2O

Member II
Job done thanks for the help now to see if it works
 

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TAPH2O

Member II
Got it made but engine won’t let us get it up to speed with the compression release engaged it goes for half a revolution then is to difficult to turn any further.
 

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Jerry VB

E32-3 / M-25XP
Sounds like your compression release is not working properly. I would engage the compression release and spin the motor with the starter. If it spins the same as when the release is not engaged (rorw rorw rorw vs. whizzz) and especially if it starts, there's your answer.
 

TAPH2O

Member II
Sounds like your compression release is not working properly. I would engage the compression release and spin the motor with the starter. If it spins the same as when the release is not engaged (rorw rorw rorw vs. whizzz) and especially if it starts, there's your answer.
Can you throw the compression release on with the engine running to tell if it has an effect without damaging the engine?
 
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